Permutation and alarm lock



March 14, 1944. E. E. A. HINNERFELDT 2,344,088

PERMUTATION AND ALARM LOCK Filed Sept. 6, 1959 I v v up Patented Mar.14, 1944 PERMUTA' IION AND ALARM LOCK Einer Eiby Andersen Hinnerfeldt,Kirkehoerup, Als, Denmark; vested in the Alien Property CustodianApplication September 6, 1939, Serial No. 293,586 In Denmark October 19,1938 2 Claims.

The present invention relates to an improved permutation lock, and oneobject of the invention is to provide a permutation which may beemployed in connection with such door locks that have a bolt operated bymeans of a handle or knob attached to a spindle that is rotated by thesaid handle or knob, without any other alteration of the lock devicethan the removal of the said spindle and handle. Another object of theinvention is to provide a construction of such a permutation device inwhich an axial and a rotational motion are required for the operation ofthe lock, said axial motion being utilized for operating a contactdevice in case of an incorrect adjustment of the permutation device. Theinvention is mainly characterized by a system of coaxially disposedrotatable shaft members each carrying on one end a knob provided withnumerals or the like for determining the relative positions of theshafts that have means for preventing their displacement axially inrelation to each other, but which allows the free rotational motion ofthe shafts independently of each other. The exterior shaft has means forconnecting it to the lock bolt operating member of the look when thesystem of shafts are displaced axially after the correct ad- J'ustmentof the shafts, while means are provided for causing the displacement ofcontact operating means for a contact device, when endeavours are madeto displace the system of shafts axially after an incorrect adjustmentof the shafts.

One manner of constructing a permutation lock according to the inventionis illustrated in the accompanying drawing, in which:

Fig. 1 shows the combined permutation lock in top elevation and partlyin section,

Fig. 2 is a sectional view on line II-II in Fig. 1,

Fig. 3 a sectional view on line III-III in Fig. 1,

Fig. 4 a diagrammatic view of a detail in section and Figs. 5 and 6 amodified manner of construction of a detail, seen in top and sideelevation respectively, in Fig. 5 partly in section.

The members of a permutation lock according to the present invention areassembled between two end plates I and 2, that serve partly as guideplates for a movable part of the device comprising two rods 3 and 4 thatare rigidly interconnected and spaced parallel to each other by means ofsplit rings 5 and stays 6, and partly as assembly plates for circulardiscs 'I that are clamped between spacing tubes 9 arranged on clampingrods 8. The rods 3 and 4 are displaceable longitudinally in relation tothe end plates, and each rod carries a lug I0 that coacts with a contactdevice II.

In Fig. 1 the device is shown in its inactive position, in whichposition it is held by means of coil springs arranged on the rods 3 and4 between the end plate I and the nearest stay '6. In this position thelugs ID are out of engagement with the contact devices II. The endplates I and 2 have bearings for a system of shafts comprising a spindleI3 and axially arranged therewith two tubular shafts I4 and I5. Theseshafts and thespindle are displaceable longitudinally as a unit, andmeans are provided for preventing their relative displacementlongitudinally, but which allow them to rotate independently of eachother. Such means are shown diagrammatically in Fig. 4, where a shaft 28corresponding to either the shaft I4 or spindle I3 is provided with alug 29 engaging an annular groove formed in the inner wall of a tubularshaft corresponding to either the shaft I5 or I4.

The spindle I3 and each shaft I4 and I5 carries a radially extending pinI6 that has a length and a thickness corresponding to the width andlength of the split in the rings 5 and the slots in the discs I. Theexterior tubular shaft I5 carries furthermore a toothed wheel II, whichupon the axial displacement of the system of shafts engages the teeth ofan interiorly toothed tubular sleeve member I 8, provided with a pin I9, that is attached to the bolt of a door lock 2I of conventionalconstruction, and from which lock the handles and handle spindle havepreviously been removed. By means of the pin I9 it is possible tomanipulate the bolt of the door lock 2I from the inner side of the doorindependently of the other members of the lock device according to theinvention. The spindle I3 and shafts I4 and I5 extend to the outer sideof the door 20, where each is provided with a knob 23, 24 and 25respectively, by means of which they may be rotated independently ofeach other, and be displaced longitudinally as a unit. A numeral plate22 on the outer side of the door in combination with marks on theseparate knobs allows for an adjustment from the outside of the door ofthe members I3, I4 and I 5 in relation to each other without actuatingthe rings 5, and to allow the axial displacement of the system of shaftsfor coupling the device to the sleeve I8 and thus to the bolt of thelock 2|.

The combined permutation and alarm lock operates in the followingmanner. Upon rotating the knobs 23, 24 and 25 in accordance with thepredetermined code for opening the lock, each pin I6 is moved toregister with the split in the adjacent ring 5 and the slit in theadjacent disc I. The system of shafts is then displaced for procuringengagement between the toothed wheel I1 and the sleeve l8, and byturning the knob 23 the door lock 2| can be opened. If endeavours aremade to extract the system of shafts before the correct adjustment ofthe knobs is made, the pins I6 will engage the upper edge of the rings5, and thus displace the contact device 3, 4, H], H for closing anelectric circuit.

In Figs, 5 and 6 there is shown a modified manner of constructing therings 5. In this instance the ring is formed as a projecting flange on acircular disc 25, the flange as well as the disc having a slot throughwhich the pin I6 can pass. The disc 26 is by means of a folded edgeattached to the rods 3 and 4 and clamped thereto by means of hookmembers 21 that are threaded for a nut, so that they are adjustable.

The details of construction of the above described device may be alteredwithout deviating from the scope of the invention, the essential beingthat the rings are attached in such a manner that their position may bealtered when desired.

I declare that what I claim is:

1. In a permutation lock, the combination of a. plurality of coaxiallydisposed and independently rotatable but not axially displaceable shaftmembers, a flat and longitudinally slitted ring member arranged slidableon each shaft, rods arranged longitudinally displaceable parallel to theaxis of the said shafts, means for attaching the ring members to thesaid rods, a radially extending pin attached to the one end of eachshaft member adjacent the ring on the shaft, permutation means attachedto the other end of each shaft member for adjustment of the pins inrelation to the slitted portion of the rings, and a contact lug on thesaid rods disposed to actuate a switch device upon displacementlongitudinally of the rods when any of the pins does not register withthe slitted portion of the adjacent ring.

2. In a permutation lock as claimed in the preceding claim, thecombination with the slitted ring member of a circular disc, a foldededge formed along the periphery of the said disc, and hook memberstransversely adjustable on the displaceable rods engaging detachablywith their hooked end the said folded edge of the disc.

'EINER EIBY ANDERSEN HINNERFELDT.

